Aerodynamic roughness of a plant canopy: A numerical experiment

摘要: A numerical model based on second-order closure principles was used to evaluate the response of logarithmic wind profile parameters, roughness length, z0 and displacement height, d, changes in density vertical structure an underlying canopy vegetation. The parameters were calculated by forcing equation match computed over three successive grid points model. Both d this manner functions height but from at twice a good approximation center-of-pressure within wide range densities. increased monotonically with plant center gravity length unimodal function density, increasing sparse canopies decreasing dense canopies. Vertical important. roughest those high low densities At densities, single linear relationship between evident, irrespective or structure. Evidence sensitivity arbitrarily set scale suggests that is superior traditional gradient-diffusion proximity canopy.